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Analog Devices Inc. AD7887AR-REEL7
- Part No.:
- AD7887AR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7887AR-REEL7.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,129
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Product details
Overview
AD7887AR-REEL7 from Analog Devices is a micropower, 12-bit successive approximation register (SAR) ADC supporting single- or dual-channel operation, 125 kSPS throughput, 2.7 V to 5.25 V supply, and 8-lead MSOP packaging. It features internal 2.5 V reference, SPI/QSPI/MICROWIRE-compatible serial interface, and 1 μA shutdown current - deployed in battery-powered medical instruments and portable communications equipment.
For engineers reviewing the AD7887AR-REEL7 datasheet, AD7887AR-REEL7 pinout, AD7887AR-REEL7 application, or AD7887AR-REEL7 equivalent, key selection criteria include dual/single-channel configurability via control register, 0–VREF or 0–VDD input range flexibility, 71 dB SNR at 10 kHz, ±1 LSB DNL (B grade), and MSOP-8 thermal performance (θJA = 205.9°C/W).
Technical Context
The AD7887AR-REEL7 implements a charge-redistribution SAR architecture with integrated track-and-hold acquiring signals in 500 ns. Its control logic supports four power modes (shutdown, standby, normal, automatic power-down post-conversion) managed by PM1/PM0 bits in an 8-bit write-only register.
Channel configuration is determined by the SIN/DUAL bit: single-channel mode enables AIN0 only with AIN1/VREF as reference (0–VREF range); dual-channel mode enables both AIN0 and AIN1 referenced to VDD (0–VDD range). Reference selection (internal 2.5 V or external 1.2 V to VDD) is controlled by the REF bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in instrumentation-grade applications. |
| Throughput Rate | 125 kSPS - supports real-time sampling of baseband signals up to 2.5 MHz full-power bandwidth. |
| Supply Voltage | 2.7 V to 5.25 V - enables direct interfacing with 3 V and 5 V logic systems without level-shifting circuitry. |
| SNR @ 10 kHz | 71 dB typical - ensures clean digitization of audio and sensor signals with minimal noise floor contribution. |
| Shutdown Current | 1 μA max (VDD = 2.7–3.6 V) - extends battery life in intermittent-sampling portable devices. |
| Differential Nonlinearity | ±1 LSB max (B grade) - guarantees monotonic transfer function and no missing codes to 11 bits. |
| Reference Options | Internal 2.5 V ±50 ppm/°C or external 1.2 V to VDD - allows precision scaling independent of supply rail variation. |
Pinout & Package
AD7887AR-REEL7 is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch) with exposed pad for thermal enhancement. Pinout matches SOIC_N but with reduced footprint and higher thermal resistance (θJA = 205.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select / Shutdown Enable | Active-low input initiating conversion and framing serial data; high state forces shutdown in Mode 1, enabling ultra-low-power sleep between samples. |
| 2 - VDD | Power Supply Input | Single 2.7–5.25 V rail powering analog/digital sections; serves as reference source in dual-channel mode. |
| 3 - GND | Analog Ground Reference | Common return for all internal circuitry; must be tied to system AGND plane to minimize noise coupling into conversion path. |
| 4 - AIN1/VREF | Configurable Terminal | In single-channel mode: 2.5 V reference output/input (10 kΩ impedance); in dual-channel mode: second analog input (0–VDD range). |
| 5 - AIN0 | Analog Input 0 | Primary input channel; voltage range is 0–VREF (single-channel) or 0–VDD (dual-channel), with 20 pF input capacitance. |
| 6 - DIN | Serial Data Input | Writes 8-bit control register on SCLK rising edge; tied to GND for read-only single-channel operation. |
| 7 - DOUT | Serial Data Output | Outputs 16-bit frame (4 leading zeros + 12-bit result, MSB first) on SCLK falling edge; tri-state when CS high. |
| 8 - SCLK | Serial Clock Input | Drives both serial interface timing and internal ADC conversion clock; supports up to 2 MHz with 40/60 duty cycle. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Channel Configuration | Software-selectable single- or dual-channel mode via control register - eliminates hardware redesign when adding sensor inputs. |
| Low-Power Operation Modes | Four programmable power states (shutdown, standby, normal, auto-power-down) - reduces average current to <12 μA at 1 kSPS sampling. |
| Integrated Reference | On-chip 2.5 V ±50 ppm/°C reference with external overdrive capability (1.2 V to VDD) - removes need for external reference IC in space-constrained designs. |
| SPI-Compatible Interface | Native support for SPI/QSPI/MICROWIRE/DSP protocols - simplifies integration with common microcontrollers without protocol translation logic. |
| High DC Accuracy | ±1 LSB DNL (B grade), ±2 LSB INL, ±3 LSB offset error - enables precise measurement in closed-loop control and calibration-critical systems. |
Applications
| Portable Medical Instrumentation | Battery-Powered PDA Systems |
|---|---|
Use Scenario: Continuous acquisition of ECG or blood oxygen sensor signals in handheld diagnostic devices operating on coin-cell batteries. IC Role / Device Role / Timing Role: 12-bit SAR ADC performing single-channel sampling at 1–10 kSPS with automatic shutdown between conversions. Use Value: 1 μA shutdown current and 2 mW normal-mode dissipation extend battery runtime beyond 100 hours per charge. |
Use Scenario: Digitizing touchscreen controller voltages and ambient light sensor outputs in personal digital assistants with tight PCB area constraints. IC Role / Device Role / Timing Role: Dual-channel ADC scanning two analog inputs alternately using CH bit in control register. Use Value: 8-lead MSOP package saves >40% board area vs. SOIC-8 while maintaining full 125 kSPS throughput and 71 dB SNR. |
| Industrial Sensor Signal Conditioning | Modem Analog Front-End |
Use Scenario: Converting 4–20 mA loop sensor outputs and temperature transducer voltages in field-deployed industrial controllers. IC Role / Device Role / Timing Role: Single-channel ADC with external 2.5 V reference for ratiometric accuracy across wide temperature range (−40°C to +125°C). Use Value: ±1 LSB DNL and ±50 ppm/°C reference drift ensure stable 12-bit linearity without periodic recalibration. |
Use Scenario: Sampling baseband analog signals in high-speed DSL or cable modem receivers requiring low-noise, high-throughput digitization. IC Role / Device Role / Timing Role: Dual-channel ADC capturing I/Q signal pairs simultaneously at 125 kSPS with 2.5 MHz full-power bandwidth. Use Value: −80 dB channel-to-channel isolation and 71 dB SNR preserve signal integrity in RF-sensitive communication subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7476ARTZ-REEL7 | Single-channel only; 1 MSPS max; no internal reference; 6-lead SOT-23 package. | Lacks dual-channel capability and reference flexibility; suited for cost-sensitive, high-speed single-input systems. | Select when throughput >125 kSPS is required and dual-channel operation is unnecessary. |
| ADS7822U | 2.7–5.25 V supply; 125 kSPS; SPI interface; 8-lead SOIC; no internal reference; 1.5 μA shutdown. | Requires external reference; SOIC-8 footprint larger than MSOP; identical dynamic specs but lower DC accuracy (±4 LSB INL). | Choose when legacy SOIC layout compatibility is mandatory and internal reference is not needed. |
Compared with AD7887AR-REEL7, AD7476ARTZ-REEL7 trades channel flexibility for speed and size, while ADS7822U sacrifices reference integration and DC precision for SOIC compatibility - making AD7887AR-REEL7 optimal for new designs prioritizing dual-channel configurability, internal reference, and MSOP space savings.
Availability
AD7887AR-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable communications devices, industrial sensor interfaces, and high-speed modem front-ends requiring stable component supply across automotive-qualified temperature ranges (−40°C to +125°C).
Supply support for AD7887AR-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7887 belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-accuracy data acquisition in space- and energy-constrained embedded systems where reliability across extended temperature ranges is critical.
FAQ
What is the maximum sampling rate supported by the AD7887AR-REEL7?
The AD7887AR-REEL7 achieves a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK. This is achieved through a 16-cycle conversion time (14.5 cycles for conversion + 1.5 cycles for track/hold acquisition), enabling real-time digitization of signals up to 2.5 MHz full-power bandwidth. The part maintains specified SNR and THD performance at this rate across its full operating temperature range.
Does the AD7887AR-REEL7 require an external reference voltage?
No - the AD7887AR-REEL7 integrates a precision 2.5 V reference with ±50 ppm/°C temperature coefficient, accessible at the AIN1/VREF pin in single-channel mode. However, that same pin can be overdriven with an external reference from 1.2 V to VDD when higher accuracy or different scaling is required. In dual-channel mode, VDD serves as the reference, eliminating need for any external reference component.
How does the AD7887AR-REEL7 handle dual-channel versus single-channel operation?
The AD7887AR-REEL7 configures channel count via the SIN/DUAL bit in its 8-bit control register: a '0' selects single-channel mode (AIN0 only, AIN1/VREF as reference), while a '1' enables dual-channel mode (AIN0 and AIN1, both referenced to VDD). The CH bit then selects which channel converts next. Default power-up state is single-channel read-only mode, requiring no DIN activity.
What power management options are available on the AD7887AR-REEL7?
The AD7887AR-REEL7 offers four distinct power modes controlled by PM1/PM0 bits: Mode 1 (CS-gated shutdown), Mode 2 (always-on), Mode 3 (auto-shutdown after conversion), and Mode 4 (standby with reference active). Shutdown current is 1 μA max at 3 V, and standby mode reduces wake-up latency versus full shutdown - allowing rapid resumption of sampling in event-driven systems.
Is the AD7887AR-REEL7 compatible with standard microcontroller SPI peripherals?
Yes - the AD7887AR-REEL7's serial interface is fully compatible with SPI, QSPI, MICROWIRE, and DSP protocols. It uses CS-active-low framing, SCLK-driven timing, MSB-first 16-bit output (4 leading zeros + 12-bit result), and supports bidirectional data transfer (DIN for control register writes, DOUT for conversion results). No special timing or polarity requirements beyond standard SPI Mode 0/3 apply.
AD7887AR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125k
- Number of Inputs:
- 1, 2
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7887AR-REEL7 FAQ
1.How can I place an order for AD7887AR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7887AR-REEL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7887AR-REEL7 reliable?
The price and inventory of AD7887AR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7887AR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7887AR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7887AR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7887AR-REEL7?
AD7887AR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7887AR-REEL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7887AR-REEL7?
For technical support, including AD7887AR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7887AR-REEL7 requirements.
6.How does Aetrix verify that AD7887AR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7887AR-REEL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7887AR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7887AR-REEL7?
All AD7887AR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7887AR-REEL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7887AR-REEL7 part is unused and in its original packaging.
Return procedure for AD7887AR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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